<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
    <title>无标题文档</title>
    <style type="text/css">
        body {
            font-family:"宋体";
            font-size:12px;
        }
        .menu {
            height:30px;
            background:#e6e6e6;
            margin-left:10px;
        }
        .menu a {
            text-decoration:none;
        }
        ul {
            margin:0;
            padding:0;
        }
        .menu li {
            list-style:none;
            float:left;
            width:90px;
            overflow:visible;
            cursor:pointer;
        }
        ul.level0 {
            height:30px;
            overflow:visible;
        }
        ul.level1, ul.level2, ul.level3 {
            width:90px;
            display:none;
        }
        ul.level2, ul.level3 {
            margin:-28px 0 0 90px;
        }
        ul.level0 > li {
            height:30px;
            line-height:30px;
            text-align:center;
            background:#999;
        }
        ul.level1 > li, ul.level2 > li, ul.level3 > li {
            height:28px;
            line-height:28px;
            background:#bbb;
        }
        ul.level0 > li:hover {
            background:#ccc;
        }
        ul.level1 > li:hover, ul.level2 > li:hover, ul.level3 > li:hover {
            background:#ddd;
        }
        ul.level0 > li.imyeah:hover > ul, ul.level1 > li.imyeah:hover > ul, ul.level2 > li.imyeah:hover > ul, ul.level3 > li.imyeah:hover > ul {
            display:block;
        }
    </style>
</head>
<body>


<div class="menu">
    <ul class="level0">
        <li class="imyeah"> <a href="#">immenu0</a>
            <ul class="level1">
                <li> <a href="#">imdropmenu00</a> </li>
                <li class="imyeah"> <a href="#">imdropmenu01</a>
                    <ul class="level2">
                        <li class="imyeah"> <a href="#">imdropmenu010</a>
                            <ul class="level3">
                                <li> <a href="#">imdropmenu0100</a> </li>
                                <li> <a href="#">imdropmenu0101</a> </li>
                            </ul>
                        </li>
                        <li> <a href="#">imdropmenu011</a> </li>
                        <li> <a href="#">imdropmenu012</a> </li>
                    </ul>
                </li>
                <li> <a href="#">imdropmenu02</a> </li>
                <li> <a href="#">imdropmenu03</a> </li>
                <li> <a href="#">imdropmenu04</a> </li>
            </ul>
        </li>
        <li class="imyeah"> <a href="#" class="top_link">immenu1</a>
            <ul class="level1">
                <li class="imyeah"> <a href="#">imdropmenu10</a>
                    <ul class="level2">
                        <li> <a href="#">imdropmenu100</a> </li>
                        <li class="imyeah"> <a href="#">imdropmenu101</a>
                            <ul class="level3">
                                <li> <a href="#">imdropmenu1010</a> </li>
                                <li> <a href="#">imdropmenu1011</a> </li>
                            </ul>
                        </li>
                        <li> <a href="#">imdropmenu102</a> </li>
                    </ul>
                </li>
                <li> <a href="#">imdropmenu11</a> </li>
                <li> <a href="#">imdropmenu12</a> </li>
                <li> <a href="#">imdropmenu13</a> </li>
                <li> <a href="#">imdropmenu14</a> </li>
                <li> <a href="#">imdropmenu15</a> </li>
            </ul>
        </li>
        <li class="imyeah"> <a href="#" class="top_link">immenu2</a>
            <ul class="level1">
                <li> <a href="#">imdropmenu20</a> </li>
                <li> <a href="#">imdropmenu21</a> </li>
            </ul>
        </li>
        <li class="imyeah"> <a href="#" class="top_link">immenu3</a>
            <ul class="level1">
                <li> <a href="#">imdropmenu30</a> </li>
                <li> <a href="#">imdropmenu31</a> </li>
                <li> <a href="#">imdropmenu32</a> </li>
            </ul>
        </li>
        <li> <a href="#" class="top_link">immenu4</a> </li>
    </ul>
</div>
</body>
</html>